The TiO2 ceramics were prepared by a solid-state reaction in the temperature range of 920–1100°C for 2h and 5h using TiO2 nano-particles (Degussa-P25 TiO2) as the starting materials. The sinterability and microwave properties of the TiO2 ceramics as a function of the sintering temperature were studied. It was demonstrated that the rutile phase TiO2 ceramics with good compactness could be readily synthesized from the Degussa-P25 TiO2 powder in the temperature range of 920–1100°C without the addition of any glasses. Moreover, the TiO2 ceramics sintered at 1100°C/2h and 920°C/5h demonstrated excellent microwave dielectric properties, such as permittivity (Ɛr) value >100, Q×f >23,000GHz and τf≅200ppm/°C.